ok so messing about i went to kick my sister of the network and to my surprie i find an "unknown" wireless device attached to the network! ive no idea who it is, ive connected all 5 pcs up and the ps3 and itas not any of them, ive got the mac addy and the ip addy, what should i do? should i try and find out who it is? or should i report it to the police? or just change my wepkey?? thanks!